Osmium: atomic number 76

Purity of metals

All I want to know is what these percentages mean 99% 2N 99.9% 3N     99.99% 4N   99.999% 5N     99.9999% 6N, and which one is bullion for these elements.

error in units

The units of resistivity don't come out right.

10^-8 Ohm * m
m Ohm * cm

the 'm' should be a 'mu', but unfortunately they both look the same in the latin alphabet.


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